In general, a necklace is defined as any type of chain or length of precious metal or gems. They are also available in pendant styles that feature a single diamond, gemstone, fine metal design, or pearl, usually suspended from a chain. A pearl strand is a length of closely strung pearls.
Chains go with everything. A fine platinum chain in a choker length will add just a touch of shine. Consider giving her an 18-inch, sterling silver or 18k gold chain to add an element of visual interest to her wardrobe.
Pearl strands are an essential element to a woman's jewelry wardrobe. She can wear one with a dress to create a classy look.